What can we learn about GRB from the variability timescale related correlations?

Abstract

Recently, two empirical correlations related to the minimum variability timescale ($\mathrm{MTS}$) of the lightcures are discovered in gamma-ray bursts (GRBs). One is the anti-correlation between $\mathrm{MTS}$ and Lorentz factor $\Gamma$, the other is the anti-correlation between the $\mathrm{MTS}$ and gamma-ray luminosity $L_{\gamma }$. Both the two correlations might be used to explore the activity of the central engine of GRBs. In this paper we try to understand these empirical correlations by combining two popular black hole (BH) central engine models (namely, Blandford \& Znajek mechanism and neutrino-dominated accretion flow). By taking the $\mathrm{MTS}$ as the timescale of viscous instability of the neutrino-dominated accretion flow (NDAF), we find that these correlations favor the scenario in which the jet is driven by Blandford-Znajek (BZ) mechanism.

6 pages, 3 figures, accepted for publication in ApJ

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Cited by in corpus (12)

• Neutrino-dominated accretion flows as the central engine of gamma-ray bursts
• Hyperaccreting Black Hole as Gamma-Ray Burst Central Engine. II. Temporal evolution of central engine parameters during Prompt and Afterglow Phases
• Signature of a New-Born Black Hole from the Collapse of a Supra-massive Millisecond Magnetar
• GRB minimum variability timescale with Insight-HXMT and Swift: implications for progenitor models, dissipation physics and GRB classifications
• Triggering the Untriggered: The First Einstein Probe-Detected Gamma-Ray Burst 240219A and Its Implications
• Giant X-ray and optical Bump in GRBs: evidence for fall-back accretion model
• Testing Blandford-Znajek mechanism in black hole hyperaccretion flows for long-duration gamma-ray bursts
• Constraints on Gamma-ray Burst Inner Engines in a Blandford-Znajek Framework
• A MAD Explanation for the Correlation between Bulk Lorentz Factor and Minimum Variability Timescale
• Photometric and Spectroscopic Observations of GRB 190106A: Emission from Reverse and Forward Shocks with Late-time Energy Injection
• Constraining Properties of GRB Central Engines with X-ray flares
• Comparative Statistical Analysis of Prompt and Afterglow X-Ray Flares in Gamma-Ray Bursts: Insights into Extended Central Engine Activity